[PATCH v3 10/10] iw_cxgb4: Add id and hw resource management functions.

Steve Wise
2010-04-16T18:30:18Z

drivers/infiniband/hw/cxgb4/resource.c | 417 ++++++++++++++++++++++++++++++++
1 files changed, 417 insertions(+), 0 deletions(-)
create mode 100644 drivers/infiniband/hw/cxgb4/resource.c

diff --git a/drivers/infiniband/hw/cxgb4/resource.c b/drivers/infiniband/hw/cxgb4/resource.c
new file mode 100644
index 0000000..fb195d1
--- /dev/null
+++ b/drivers/infiniband/hw/cxgb4/resource.c
@@ -0,0 +1,417 @@
+/*
+ * Copyright (c) 2009-2010 Chelsio, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+/* Crude resource management */
+#include <linux/kernel.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/kfifo.h>
+#include <linux/spinlock.h>
+#include <linux/errno.h>
+#include <linux/genalloc.h>
+#include "iw_cxgb4.h"
+
+#define RANDOM_SIZE 16
+
+static int __c4iw_init_resource_fifo(struct kfifo *fifo,
+ spinlock_t *fifo_lock,
+ u32 nr, u32 skip_low,
+ u32 skip_high,
+ int random)
+{
+ u32 i, j, entry = 0, idx;
+ u32 random_bytes;
+ u32 rarray[16];
+ spin_lock_init(fifo_lock);
+
+ if (kfifo_alloc(fifo, nr * sizeof(u32), GFP_KERNEL))
+ return -ENOMEM;
+
+ for (i = 0; i < skip_low + skip_high; i++)
+ kfifo_in(fifo, (unsigned char *) &entry, sizeof(u32));
+ if (random) {
+ j = 0;
+ random_bytes = random32();
+ for (i = 0; i < RANDOM_SIZE; i++)
+ rarray[i] = i + skip_low;
+ for (i = skip_low + RANDOM_SIZE; i < nr - skip_high; i++) {
+ if (j >= RANDOM_SIZE) {
+ j = 0;
+ random_bytes = random32();
+ }
+ idx = (random_bytes >> (j * 2)) & 0xF;
+ kfifo_in(fifo,
+ (unsigned char *) &rarray[idx],
+ sizeof(u32));
+ rarray[idx] = i;
+ j++;
+ }
+ for (i = 0; i < RANDOM_SIZE; i++)
+ kfifo_in(fifo,
+ (unsigned char *) &rarray[i],
+ sizeof(u32));
+ } else
+ for (i = skip_low; i < nr - skip_high; i++)
+ kfifo_in(fifo, (unsigned char *) &i, sizeof(u32));
+
+ for (i = 0; i < skip_low + skip_high; i++)
+ if (kfifo_out_locked(fifo, (unsigned char *) &entry,
+ sizeof(u32), fifo_lock))
+ break;
+ return 0;
+}
+
+static int c4iw_init_resource_fifo(struct kfifo *fifo, spinlock_t * fifo_lock,
+ u32 nr, u32 skip_low, u32 skip_high)
+{
+ return __c4iw_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
+ skip_high, 0);
+}
+
+static int c4iw_init_resource_fifo_random(struct kfifo *fifo,
+ spinlock_t *fifo_lock,
+ u32 nr, u32 skip_low, u32 skip_high)
+{
+ return __c4iw_init_resource_fifo(fifo, fifo_lock, nr, skip_low,
+ skip_high, 1);
+}
+
+static int c4iw_init_qid_fifo(struct c4iw_rdev *rdev)
+{
+ u32 i;
+
+ spin_lock_init(&rdev->resource.qid_fifo_lock);
+
+ if (kfifo_alloc(&rdev->resource.qid_fifo, T4_MAX_QIDS * sizeof(u32),
+ GFP_KERNEL))
+ return -ENOMEM;
+
+ for (i = T4_QID_BASE; i < T4_QID_BASE + T4_MAX_QIDS; i++)
+ if (!(i & rdev->qpmask))
+ kfifo_in(&rdev->resource.qid_fifo,
+ (unsigned char *) &i, sizeof(u32));
+ return 0;
+}
+
+/* nr_* must be power of 2 */
+int c4iw_init_resource(struct c4iw_rdev *rdev, u32 nr_tpt, u32 nr_pdid)
+{
+ int err = 0;
+ err = c4iw_init_resource_fifo_random(&rdev->resource.tpt_fifo,
+ &rdev->resource.tpt_fifo_lock,
+ nr_tpt, 1, 0);
+ if (err)
+ goto tpt_err;
+ err = c4iw_init_qid_fifo(rdev);
+ if (err)
+ goto qid_err;
+ err = c4iw_init_resource_fifo(&rdev->resource.pdid_fifo,
+ &rdev->resource.pdid_fifo_lock,
+ nr_pdid, 1, 0);
+ if (err)
+ goto pdid_err;
+ return 0;
+pdid_err:
+ kfifo_free(&rdev->resource.qid_fifo);
+qid_err:
+ kfifo_free(&rdev->resource.tpt_fifo);
+tpt_err:
+ return -ENOMEM;
+}
+
+/*
+ * returns 0 if no resource available
+ */
+u32 c4iw_get_resource(struct kfifo *fifo, spinlock_t *lock)
+{
+ u32 entry;
+ if (kfifo_out_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock))
+ return entry;
+ else
+ return 0;
+}
+
+void c4iw_put_resource(struct kfifo *fifo, u32 entry, spinlock_t *lock)
+{
+ PDBG("%s entry 0x%x\n", __func__, entry);
+ kfifo_in_locked(fifo, (unsigned char *) &entry, sizeof(u32), lock);
+}
+
+u32 c4iw_get_cqid(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx)
+{
+ struct c4iw_qid_list *entry;
+ u32 qid;
+ int i;
+
+ mutex_lock(&uctx->lock);
+ if (!list_empty(&uctx->cqids)) {
+ entry = list_entry(uctx->cqids.next, struct c4iw_qid_list,
+ entry);
+ list_del(&entry->entry);
+ qid = entry->qid;
+ kfree(entry);
+ } else {
+ qid = c4iw_get_resource(&rdev->resource.qid_fifo,
+ &rdev->resource.qid_fifo_lock);
+ if (!qid)
+ goto out;
+ for (i = qid+1; i & rdev->qpmask; i++) {
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ goto out;
+ entry->qid = i;
+ list_add_tail(&entry->entry, &uctx->cqids);
+ }
+
+ /*
+ * now put the same ids on the qp list since they all
+ * map to the same db/gts page.
+ */
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ goto out;
+ entry->qid = qid;
+ list_add_tail(&entry->entry, &uctx->qpids);
+ for (i = qid+1; i & rdev->qpmask; i++) {
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ goto out;
+ entry->qid = i;
+ list_add_tail(&entry->entry, &uctx->qpids);
+ }
+ }
+out:
+ mutex_unlock(&uctx->lock);
+ PDBG("%s qid 0x%x\n", __func__, qid);
+ return qid;
+}
+
+void c4iw_put_cqid(struct c4iw_rdev *rdev, u32 qid,
+ struct c4iw_dev_ucontext *uctx)
+{
+ struct c4iw_qid_list *entry;
+
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ return;
+ PDBG("%s qid 0x%x\n", __func__, qid);
+ entry->qid = qid;
+ mutex_lock(&uctx->lock);
+ list_add_tail(&entry->entry, &uctx->cqids);
+ mutex_unlock(&uctx->lock);
+}
+
+u32 c4iw_get_qpid(struct c4iw_rdev *rdev, struct c4iw_dev_ucontext *uctx)
+{
+ struct c4iw_qid_list *entry;
+ u32 qid;
+ int i;
+
+ mutex_lock(&uctx->lock);
+ if (!list_empty(&uctx->qpids)) {
+ entry = list_entry(uctx->qpids.next, struct c4iw_qid_list,
+ entry);
+ list_del(&entry->entry);
+ qid = entry->qid;
+ kfree(entry);
+ } else {
+ qid = c4iw_get_resource(&rdev->resource.qid_fifo,
+ &rdev->resource.qid_fifo_lock);
+ if (!qid)
+ goto out;
+ for (i = qid+1; i & rdev->qpmask; i++) {
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ goto out;
+ entry->qid = i;
+ list_add_tail(&entry->entry, &uctx->qpids);
+ }
+
+ /*
+ * now put the same ids on the cq list since they all
+ * map to the same db/gts page.
+ */
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ goto out;
+ entry->qid = qid;
+ list_add_tail(&entry->entry, &uctx->cqids);
+ for (i = qid; i & rdev->qpmask; i++) {
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ goto out;
+ entry->qid = i;
+ list_add_tail(&entry->entry, &uctx->cqids);
+ }
+ }
+out:
+ mutex_unlock(&uctx->lock);
+ PDBG("%s qid 0x%x\n", __func__, qid);
+ return qid;
+}
+
+void c4iw_put_qpid(struct c4iw_rdev *rdev, u32 qid,
+ struct c4iw_dev_ucontext *uctx)
+{
+ struct c4iw_qid_list *entry;
+
+ entry = kmalloc(sizeof *entry, GFP_KERNEL);
+ if (!entry)
+ return;
+ PDBG("%s qid 0x%x\n", __func__, qid);
+ entry->qid = qid;
+ mutex_lock(&uctx->lock);
+ list_add_tail(&entry->entry, &uctx->qpids);
+ mutex_unlock(&uctx->lock);
+}
+
+void c4iw_destroy_resource(struct c4iw_resource *rscp)
+{
+ kfifo_free(&rscp->tpt_fifo);
+ kfifo_free(&rscp->qid_fifo);
+ kfifo_free(&rscp->pdid_fifo);
+}
+
+/*
+ * PBL Memory Manager. Uses Linux generic allocator.
+ */
+
+#define MIN_PBL_SHIFT 8 /* 256B == min PBL size (32 entries) */
+
+u32 c4iw_pblpool_alloc(struct c4iw_rdev *rdev, int size)
+{
+ unsigned long addr = gen_pool_alloc(rdev->pbl_pool, size);
+ PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size);
+ return (u32)addr;
+}
+
+void c4iw_pblpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
+{
+ PDBG("%s addr 0x%x size %d\n", __func__, addr, size);
+ gen_pool_free(rdev->pbl_pool, (unsigned long)addr, size);
+}
+
+int c4iw_pblpool_create(struct c4iw_rdev *rdev)
+{
+ unsigned pbl_start, pbl_chunk, pbl_top;
+
+ rdev->pbl_pool = gen_pool_create(MIN_PBL_SHIFT, -1);
+ if (!rdev->pbl_pool)
+ return -ENOMEM;
+
+ pbl_start = rdev->lldi.vr->pbl.start;
+ pbl_chunk = rdev->lldi.vr->pbl.size;
+ pbl_top = pbl_start + pbl_chunk;
+
+ while (pbl_start < pbl_top) {
+ pbl_chunk = min(pbl_top - pbl_start + 1, pbl_chunk);
+ if (gen_pool_add(rdev->pbl_pool, pbl_start, pbl_chunk, -1)) {
+ PDBG("%s failed to add PBL chunk (%x/%x)\n",
+ __func__, pbl_start, pbl_chunk);
+ if (pbl_chunk <= 1024 << MIN_PBL_SHIFT) {
+ printk(KERN_WARNING MOD
+ "Failed to add all PBL chunks (%x/%x)\n",
+ pbl_start,
+ pbl_top - pbl_start);
+ return 0;
+ }
+ pbl_chunk >>= 1;
+ } else {
+ PDBG("%s added PBL chunk (%x/%x)\n",
+ __func__, pbl_start, pbl_chunk);
+ pbl_start += pbl_chunk;
+ }
+ }
+
+ return 0;
+}
+
+void c4iw_pblpool_destroy(struct c4iw_rdev *rdev)
+{
+ gen_pool_destroy(rdev->pbl_pool);
+}
+
+/*
+ * RQT Memory Manager. Uses Linux generic allocator.
+ */
+
+#define MIN_RQT_SHIFT 10 /* 1KB == min RQT size (16 entries) */
+
+u32 c4iw_rqtpool_alloc(struct c4iw_rdev *rdev, int size)
+{
+ unsigned long addr = gen_pool_alloc(rdev->rqt_pool, size << 6);
+ PDBG("%s addr 0x%x size %d\n", __func__, (u32)addr, size << 6);
+ return (u32)addr;
+}
+
+void c4iw_rqtpool_free(struct c4iw_rdev *rdev, u32 addr, int size)
+{
+ PDBG("%s addr 0x%x size %d\n", __func__, addr, size << 6);
+ gen_pool_free(rdev->rqt_pool, (unsigned long)addr, size << 6);
+}
+
+int c4iw_rqtpool_create(struct c4iw_rdev *rdev)
+{
+ unsigned rqt_start, rqt_chunk, rqt_top;
+
+ rdev->rqt_pool = gen_pool_create(MIN_RQT_SHIFT, -1);
+ if (!rdev->rqt_pool)
+ return -ENOMEM;
+
+ rqt_start = rdev->lldi.vr->rq.start;
+ rqt_chunk = rdev->lldi.vr->rq.size;
+ rqt_top = rqt_start + rqt_chunk;
+
+ while (rqt_start < rqt_top) {
+ rqt_chunk = min(rqt_top - rqt_start + 1, rqt_chunk);
+ if (gen_pool_add(rdev->rqt_pool, rqt_start, rqt_chunk, -1)) {
+ PDBG("%s failed to add RQT chunk (%x/%x)\n",
+ __func__, rqt_start, rqt_chunk);
+ if (rqt_chunk <= 1024 << MIN_RQT_SHIFT) {
+ printk(KERN_WARNING MOD
+ "Failed to add all RQT chunks (%x/%x)\n",
+ rqt_start, rqt_top - rqt_start);
+ return 0;
+ }
+ rqt_chunk >>= 1;
+ } else {
+ PDBG("%s added RQT chunk (%x/%x)\n",
+ __func__, rqt_start, rqt_chunk);
+ rqt_start += rqt_chunk;
+ }
+ }
+ return 0;
+}
+
+void c4iw_rqtpool_destroy(struct c4iw_rdev *rdev)
+{
+ gen_pool_destroy(rdev->rqt_pool);